John, apologies in advance for the pedantry (an occupational hazard) but surely, owing to air resistance, in this as in other things size matters. Mass on the other hand does not. Perhaps I can suggest a small edit of your excellent doggerel (can doggerel be excellent? I think you have shown it can.)

Heavy or light when released from the topHas no effect on the rate that things drop .....

I have a feeling that there would be a market for a book of rhymes illustrating scientific and mathematical principles, illustrated in your inimitable way. Can I suggest a couple of my own:

The classical myth of an instant creationIs a very poor way to explain speciation

Instead, Darwin mooted, after long introspectionVariety follows form natural selection

Or how about

Pythagoras' disciples were rational menWho insisted that numbers were rational, then one of their number, Hippasus, gave wordOf a proof that the square root of two was absurd.On hearing the news that this proof had been foundThe brothers ensured that Hippasus was drowned.

I am sure you could write enough for a small gem of a Christmas stocking filler!

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